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Table 1 Numbers of Helicoverpa armigera and Corcyra cephalonica eggs consumed and Manly’s index of preference for nymph and adult of Geocoris ochropterus given a choice of unparasitized and parasitized eggs by Trichogramma chilonis

From: Intraguild predation on Trichogramma chilonis Ishii (Hymenoptera: Trichogrammatidae) by the generalist predator Geocoris ochropterus Fieber (Hemiptera: Geocoridae)

Lepidopteran egg Predator stage No. of unparasitized eggs consumed (mean ± SE) No. of parasitized eggs consumed (mean ± SE) Manly’s index of preferencea
df = 13, P < 0.001
     β1 (preference) (mean ± SE) t
Helicoverpa armigera G. ochropterus fifth instar 20.7 ± 0.76 1.64 ± 0.38 0.97 ± 0.01 80.1
G. ochropterus adult 26.57 ± 1.14 3.28 ± 0.22 0.95 ± 0.004 118.3
Corcyra cephalonica G. ochropterus fifth instar 21.29 ± 0.93 1.35 ± 0.39 0.96 ± 0.01 53.6
  G. ochropterus adult 23.7 ± 1 2.07 ± 0.54 0.94 ± 0.01 47.2
  1. aOne-sample t tests by comparing Manly’s index for non-parasitized eggs and a value of 0.5 to test the null hypothesis that the predator selected prey at random